Example 14 : Postprocessors and Code Verification

Complete Source Files

ex14.i

Example 14 Output

Example 14 Output

Postprocessor Values:
+----------------+----------------+----------------+
| time           | dofs           | integral       |
+----------------+----------------+----------------+
|   0.000000e+00 |   1.210000e+02 |   7.071068e-01 |
|   1.000000e+00 |   1.210000e+02 |   2.359249e+00 |
|   2.000000e+00 |   4.410000e+02 |   3.093980e-01 |
|   3.000000e+00 |   1.681000e+03 |   8.861951e-02 |
|   4.000000e+00 |   6.561000e+03 |   2.297902e-02 |
|   5.000000e+00 |   2.592100e+04 |   5.797875e-03 |
|   6.000000e+00 |   1.030410e+05 |   1.452813e-03 |
+----------------+----------------+----------------+

Comparison to a Fine Grid Solution

Also present in Example 14 are two input files (ex14_solution_comparison_1.i and ex14_solution_comparison_1.i) that demonstrate how to use a SolutionUserObject to read in a fine grid solution and then compare a coarse grid solution to that using ElementL2Error.

• The first input file computes the fine grid solution and outputs an XDA file.

• An XDA file contains the full set of sata necessary to perfectly read in a previous solution...even on adapted meshes.

• The second inout file uses SolutionUserObject to read in the fine-grid solution.

• Next, a SolutionFunction utilizes the SolutionUserObject to present the solution field as a MOOSE Function.

• Finally, an ElementL2ErrorPostprocessor is utilized to compute the difference between the solutions.

ex14_compare_solutions_1.i

ex14_compare_solutions_2.i